Printing-press blanket clamp



Oct. 2, -l928.- 6 7 1,686,065

J. R. BLAINE PRINTiNG PRESS- BLANKET CLAMP Filed Feb. 28, 1927 [U ITED STATES r 7 shown in Figure 1. r

a recess or .cut away portion within which are arranged the gripper mech i e ofitsedges being 3:

- jtions of which are the Shift 17' by example as-an impression cylinder of an ofi blanket or the like is 'securel locked in its 'by the combination of parts described in the v 'grelm phic press; while 1 i subj ect of the jusual -manner .on the means of set screws 16.

1 g PP for examp s r ly e portion 23 pro 'ded-m the bracket'18.-

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more, 1 com'om'rron or p Panama-runes Bram! I muses nleah'bruary 28,1927 s n l No. 121,511.

engaged by means of clamping bars 26 and 27, preferabliy;1 lockedtogether by means of screws28. order to lold the ede 25 in position, the bracket 18, is-preferab y pro v ded; with an abutment surface 29 which engages the bar 27 when the respective parts are in their assembled position. The bracket 18 is also formed with a projection 30 which The present invention relates to for clamping a blanket to a cylinder such for set press.

reliable and 'eflicient to provide a simplerubber combination in which the edge of a operative position on a cylin er.

A further object of the invention is to c linder frame for the purpose of limiting eliminate the necessity of providing indet,e movement of the pendent mechanism for securely clamping wall of thexrecess 11, so that that portion the edge of such rubber blanket in position. of the blanket which extends between the Another object of 'the invention resides in the provision of mechanism which issimple and e'fiective in its operation and limited to a minimum-of parts.

" These and other objects are accomplished 'i'. e.'will -not be clamped against said. ledge by the pad 22 when the bracket 18 is locked hand wheel 31- mounted onthe shaft 32. The reduced portion o'f said shaft is thread-' ed into the cylinder frame, and carries col p lar 34 held in position, preferabl by means Figure 1 is a cross sectional view of an of a in 35, and engaging a b impression blanket cylinder of a lithoformed with servesto receive and guide the shaft 32.

The bracket 36=is r'i' d1y secured to the shaft 17 The latter a o sup orts a breaket 37 adapted to slide over t e surface 38 and is formed with a projection 39 provided following description and illustrated in the accompanying drawings, in which:

gure 2 represents a partial elevation of the gripper mechamsm and associated parts -The reference number 10 denotes an impression blanket cylinder of 'an offset printmg press: andformed in its periphe with a stud 41 riveted or otherwise secured indicate at 11,

gages to an angle bar 42 which .is slidably mountanism and associatedparts, forming the resent invention. 13 indlcates a rubber blanket stretched tautover the ,impression surface of the'cylinder 10, clamped to a, pro or'lockingledge 12 proyid'ed on the yhn e1- 10. The sheet engaging grippers 14 which, however do not form part of tihis r gripper shaft 15 by one or more bolts 43 engaging wlthinloiigitudinal slots formed in the angle 'bar The bracket 37 adjustedby abolt 45 which passes through anelongated J l P i in t e lower, free end of said lever 44 engages in a slot 46 whereby the angle bar 42' can be moved to and fro after the th hasbeen loosened to release theever'44.

With .reference.to1]igure 2,' it readily: understood that when theangle bar is moved tqthe s at par s ni lbe mov dupw ly.

w i i ent'of the stud 41with1nthe 1 J b c s"! g d q fl mc e" by means of a ibolt24 -which of a stud 49, whieh operateewlthm an elonpad within the 50for1ned'1mthe V e rs.

inventiom-are. ad ustably mounted in The shaft 17 sup orts a'serieslof gripper. pad supporting bra ets 18, the bearing porslotted at-19 so that they can be readily adjusted on and clamped to meansof the locking bolts 20. On the; arm 21 of the bracket 18.is' arranged pad-in the usual manner such as retains the The edge of-thef blanket ls s sem 11;. order a place, the edge;25 or the bracket 18-towards the racket 36 an elongated slot 33 which v with anjinclined'slot 40 within which entogether with "the shaft 17 and parts mounted thereon can be readily actuation of the lever 44 piv-' oted to the base of the recess 11 by means of.

angle bar, '42. The

ATENT OFFICE-Q bears against the surface 38- formed in the ledge 12 and the pad 22 will remain free, f 7o in its operative position by means of the a ed on the base ofthe recess 11 by means'of 11w portion of V io'o' left, the bracket 37 .and

due,

blanket with the locking bars 26 and 2* thereon in operative sition, the threaded shaft 32 is released, y turning the hand of a support, a blanket carried thereby, look ing means for holding the blanket in osibecoming accidently disengaged locking ledge 12.

wheel 31" to the left so that the gripper pad supporting'bracket 18 will move away from the locking ledge 12 of the cylinder sufliciently as to permit'the insertion of the locking bars between the ledge 12 and bracket .18. The bar 26', as shown in Fig. 1, is preferabl .provided with an inclined surface whic 1 cooperates with a corresponding ly inclined locking surface 48, so as to avoid any possibility of the blanket clamping balrs 0m t 1e It will be understood that there maybe various constructional modifications embodied in the mechanism described, Without,

however, departing from the s irit of the invention; therefore, it is my intention to cover any such modifications that will come .within the scope of the appended claims;

I claim as my invention: 1-. In a printing press, the combination of a support, a blanket carried thereby, and

" a gripper pad support for locking said blanket to said first mentioned support,.

tion, a gripper pad carried by said 100 ing means, clam ing means secured to the ed e of said bla ct, and means provided on "said locking means being adapted to engage said clamping means to holdsaid blanket in its operative position.- V

-4.- In a prm' ing press, the combination of asupport, a blanket carried thereby, locking means for holding theblanket 1n osition, a gripper-pad carried by said loc ing means clampingmeans secured to the edge of said blanket, and means provided on said lockinag means comprising an abutment surface to hold said blanket in its operative position.

5. 'In a press, the combination of I operative position.

apted to engage said clampingmeans a support, a blanket carried thereby, locking means for holding the blanket in posi-' tion, avgripper pad carried by said locking means, a pairof clamping bars secured to the edge of said blanket, and an abutment surface provided on said locking means adapted to engage said clamping bars to hold said blanket inits operative position.

6. In a printing press, the combination'of a support, a blanket carried thereby, locking means for holding the blanket in position, a ripper pad carried by said locking means, 0 amping means comprising a pluralit ;of clamping bars betweenwhich one edge ot said blanket is secured, and means comprising an abutment surface on said lockmg means adapted to engageone of said clamping/bars to hold .said blanket in its a 7. In a printing press, the combination of a support, a blanket carried thereby, locking means for holding the blanket in position,

a gripper pad carried by said. locking means,

clamping means comprising a plurality of clam ing bars between which one. edge of said lanket is secured, means comprising an abutment surface on said locking means 7 adapted to engage one of said clamping bars to hold said blanket in its operative position, and means comprising a manually operated member for releasing the locking engagement of said locking means with said clamping bar.

n a printing press, the combination of a support,- a blanket carried thereby, locking means for holding the blanket in position, a gripper pad carried by said locking,

means clamping means comprising a pluralit of clamping bars bet-ween which one edge 0; said blanket is secured, means comprising an abutment surface on said locking means adapted to engage one of said clamping bars to hold said blanket in' its operative position, means comprising a manuall operated member for releasing the locking engagement of said locking means with said clamping bar, and means to limit the movement of said locking means so that when the respective parts of the mechanism are in their j operative position, the-rubber blanket will not beclamped against the cylinder wall by said gripper ad.

' Signed at hicago, Illinois, this 25th day of February, 1927. I

I JOSEPH R. BLAINE, 

